Young



July 5, 1949. 1'. YOUNG TUBULAR AIR HEATER Filed July 25. 1944 2 Sheets-Sheet 1 3 nventor omayoang 0/ Gttomeg E. I V n A l 1 l l `July 5', 1949. Y1. YouNG TUBULAR AIR HEATER Filed July 25, 1944 2 Sheets-Sheetll nventor @0f/715 azz/7 kBg I @Homes Patented July 5, 1949 UNITED STATES PATENT OFFICE TUBULAR AIR HEATER Thomas Young, Spokane, Wash.

Application July 25, 1944, Serial No. 546,487

1 Claim. 1

This invention relates to stoves and more particularly to a stove intended for heating a room or building, it being one object of the invention to provide a stove or heater formed with a combustion chamber and fuel magazine having a grate at its bottom and communicating with a heating chamber through which conduits pass for air to be heated.

Another object of the invention is to provide the combustion chamber or re box with an improved arrangement of fuel supporting grates and front and rear grates which allow air to pass horizontally through the nre box when a draft door at the front of the stove is opened and carry hot gases and other products of combustion into the heating chamber back of the combustion chamber.

Another object of the invention is to provide the heating chamber with air tubes extending vertically through the stove and increasing in diameter toward their upper ends so that as the air moves upwardly through the tubes and is heated, it may expand and now very freely through the tubes.

Another object of the invention is to provide' the stove with means for delivering warm air into the heating chamber near the back of the fire box where it will mix with unburnt gases delivered from the iire box and supply oxygen for mixing with these gases and causing them to ignite and thus supply additional heat for the air tubes instead of passing out of the heating chamber as unburnt gases.

Another object of the invention is to provide an improved arrangement of bafe plates in the heating chamber which cause the hot air and gases passing through this chamber to follow a tortuous path about the air tubes before reaching the outlet at the upper end of the back of the stove.

Another object of the invention is to provide the stove with an outlet for heated air at its top which is guarded by a readily removable grill and also provide under this grill a receptacle for holding a supply of water for imparting desired moisture to the hot air flowing upwardly from the stove.

Another object of the invention is to provide a stove simple in construction and very eicient in operation.

In the accompanying drawings:

Fig. l is a perspective view of the improved stove.

Fig. 2 is a sectional view taken vertically through the stove on the line 2-2 of Fig. 1.

Fig. 3 is a sectional view taken horizontally through the improved stove on the line 3-3 of Fig. 2.

Fig. 4 is a fragmentary sectional perspective view showing the front air inlet for the fire box and the draft door for controlling ilow of air horizontally through the fire box.

Fig. 5 is an enlarged fragmentary sectional perspective view of the device for delivering oxygen to unburnt gases passing from the back of the re box into the heating chamber.

Fig. 6 is a fragmentary sectional view showing the manner in which the gate or strip for controlling flow of air through the oxygen inlet is adjustably mounted.

This improved stove has a body formed of upper and lower sections I and 2, the lower section being supported upon a base 3 having depending supporting legs 4 and the upper section resting on and fitting snugly about the top of the lower section. The top 5 of the upper section is depressed and formed with a depending trough or receptacle 6 for holding water to supply moisture to hot air owing upwardly from the stove. Over the depressed top of the upper section is disposed a grill 1 formed of two sections connected by hinges 8 so that by grasping the knob 9, the front section 1 of the grill may be swung upwardly and rearwardly out of the way and allow access to the water receptacle 6 for filling the same when necessary. This also permits a cover Il] at the top of a fuel magazine I'I, to be slid rearwardly to open position for depositing fuel in the magazine.

The fuel magazine extends vertically for the major portion of the height of the stove and its lower portion constitutes a combustion chamber or fire box I2 where fuel at the bottom of the magazine is burned. The rear wall of the magazine has its lower portion formed with a draft opening I3 and the front wall of the lower section 2 of the stove is formed with an opening I4 so that air may flow rearwardly through the fire box when the draft door I5 is opened. By this arrangement, flow of air through the re box will be horizontal from front to back, and the fuel, such as wood, corn cobs, coal, or other solid fuel will be burned at the bottom of the supply in the magazine and the fuel in the magazine gradually sink as it is consumed. The draft door is mounted for opening and closing by hinges i6 at its bottom and, in order to secure the door closed, or partially open, there has been provided a resilient latch I1 which projects outwardly from the front of the stove over the opening I4, in position for engagement 4by a curved bill I8 carried -by the door. Gratings I9 and 2l) having Vertical slots, rest upon ledges 2l and 22 formed across the lower end of the rear wall of the magazine and across the front wall of the lower section below the draft opening I4 to hold the burning fuel or loose fuel in the nre box and these grating bars have, handles 23 and 2 4 which project upwardly inthe magazine andf terminatew near the upper end thereof so that when the cover I is shifted to open position, the handles? may be grasped and the gratings drawn upwardly out of the re box and magazine. Lugfs.-:2.l. and?. 22 hold the gratings on the ledges.

The fuel rests upon grate bars 25 which extend" across the bottom of the reaboxand; at; their; ends, are formed with trunnions 26 resting in sockets formed in ledges 21 to rockably mount the grate bars and, at one side of the re box, the'- grate barsarev provided" with depending arms'ZS pivoted-to'a shakerbar 29.y This shaker' bar has its front end -connected with a handle@- 311xJ projects--througlrthe front wall of the stovet at one side-oftliedoorflfl fory the ash-pit 32%, this door being pivoted at itsbottombyI hinges 33 and releasablyheld' closed by-a bill or keeper 341whiohiscurvedand engages a resilient latch 3'55 When the door 3-I` is opened, air may pass.y upwardly-between the grate bars and out through the rear gratingI I9` as-well as-enteringthe'fire' box-*through the' front grating and outr through the rear grating. A1- veryI goodf controlof draft isf thus permitted and fuel"atf` the bottom of theI magazine caused to burn in the rebox without burning-'- of` fuell taking place= in the='- magazine aboveA thef're boxl.

Thehotl gases 4and smoke,Y aswell vas fotherfprodi uctsofi combustiorr'which pass through the'rearf gra-ting I9 and'theopening l3'2in'theerear wall of the-fire box; enter. the heatingy chamber 36Jwhiehextends-the full height of-lthe stove-between the magazines-nd the'rear'wall ofthe stovefand hea-tA tubes-.311". which1 extendverticall'y infthe heating chamber:withtheirflower -ends mounted in collars 382:?. surrounding openings in the bottom ofthe stoveand their;l upperI endsiy mounted' throughy collars' 395 surrounding openingszin thertopni of.y the stove. These airrtubes'graduallyaincrease'irr diameter: towardf; their upper ends, so. that* the; air;I which is ,-heatedandeXpands asz-itfmoves4 up.A wardly through'the tubes', may;A flowfreely. This:-

also.-in-creasesxthearea. of the ,Y tubes. and-causes a more eflioient heating of.; the.- air. Arcuate baiiiesfl, form-ed ofrmetal, are mounted; in the heating chamber'ancl,;exten.d.linz overlappingv relal tion-.to each other, ,as shown1in1Fig. 2, so thata'szf the.- hot smoke and; gases. flow upwardly from "the", fire. boxto` the-outlet 4l, to which a: smokepipe is; to be attached, atortuous path will .be followedv andheating ofthe tubes increased.;.

It. is .desired tov have theunburnt gases-which: enter the. heating.. chamber. ignited andheat in the chamber. 35 increased.. Toaccomplishthim an opcningor slot Mis fo-rmedracross the. bottom of '.Ithe stove. Plates or. walls 43; forminga throat., for the air inlet,` extend upwardly from the bfot'- tom of the stove-along'frontiandrearfedges oft' the opening' 42 and',l at their upper ends, carry a': nozzle 44" which" is formed" of'r metaland' hasA itsK4 upper portion arcuate in cross'section and" its front andl rearwalls formed* withtv anges i andvlb defining internal ledges'which* rest'uporr upper' edges of f the'plates @31j A defleeting-platef rearward incline from the flanged lower portion of the iront wall of the nozzle, so that as air ows upwardly in the nozzle, it will be deflected rearwardly and then strike the arcuate upper portion of the nozzle which directs it forwardly and downwardly and out through the perforations 48 in the front wall without interference by the incoming air. This also causes the incoming air to. make contactv with thewallsand upper, portion ofthe nozzle as itflows. through the nozzle, and the air will be heated before passing out through the perforations and jets of warm air will be discharged from the nozzle toward the opening I3 This air mixes with the unignited gases flowingr, into theheating chamber from the re box and supplies oxygen to cause the gases to be ignited-".andburnt-,in the heating chamber. It will thus be seen that air tubes will be highly heated and air flowing throughthem well heated before flowing from the upper ends of the tubes. and through the grating 'I' to heata room or building., in whichrthezstove is' located. Itis desirableto' control'the amount?. of"air which, flows through.

the air` inlet 48"and, in order to do so, there has beenprovided a metal strip.49"serying as a damper for the.Y air inlet. Thisstrip. or damper extendstransversely of the stove againstthe under face ofethestoyebottomand its end portions slidably restr upon depressed'portions50.*ofthe frame Pins.. 5.! .carriedl by theY bottom. ofthe stove, engage. through: slots 52. formed, inthe strip diagonally` thereof; and then-when handle 53y of: the strip is grasped. and s the. strip shifted'` longitndinally, the i strip .f -will-g be. shifted.: transversely. into or. out ofi covering. relation tothe. airY inlet,. according to the direction in whichA the; strip is' shiftedn longitudinally. Sight: openings,` 54 are:` formed:.throughnsi-de; wallsv of thestovev above op positel endsffof the: nozzle 44, so:thatvby looking: through thesezopening-s; whi'chare-closed by glass; or. other suitable transparent'. material, afperson v1 can@ determine-whether thev proper quantity ofi oxygen is being fed to the gases ente-ringftheheatf ingrchamberffromthererbox.

Havingl thus -l described' the* invention, what is1 claimedis:

A'stove comprising afy body, a verticalpa-rtition' extending between side walls`r of the body and; dividingY said lb'odydnto a front fuel-chamber and'- afrearheating-chamber; saidpartition having its' upper endconnected withv the: top ofY the' body'I and its lower end spaced from' thebottom oftheA body;` gra-te lbarsl across the bottom' of the' fuel chamber, thel lower portion-of the fuel'chamber' constituting a'flre-box 1 having the' grate barsy at* its bottomand'theportion'oflv the body under they-grate' bars constituting'an' ash pit, airtubes extendingw vertically in-A the heatingchamben, said tubes being tapered downwardly andliaving upper andlowerends mounted through'openings irr-tl'ie -top and -tleebottom-A of the body, and 'plates' extending in opposite directions'fromthe parti-v tion and"V the* rear wall ofthe-bodyv for the' full" l width-of lthe body; said 4plates beingf'spaced'Verti-r orfbaflle14fl extends upwardlyfinthfe nozzleat af 75'PJ chamberback' andforth-between"therear'wall and the partition and serving as braces for the tubes.

THOMAS YOUNG.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date McFarland May 15, 1877 Bessen Nov. 27, 1868 Rossman Mar. 29, 1898 Cherry Nov. 5, 1918 Number Number 

